Re: purge
- From: Peter Hill <peter.usenet1@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 13 Sep 2005 17:21:43 +0100
On Tue, 13 Sep 2005 18:20:19 +0300, "Peter" <peter@xxxxxxxxxxxxxxxx>
wrote:
>>>> Can anybody explain how I can purge an LPG tank of air.
>>>
>>>Drive it empty (until it won't even idle) coupla times. And, google is ur
>>>friend - this matter has been discussed in the group before
>>>
>
>> Forgive my ignorance, I'm new here and to LPG as a vehicle fuel, but
>> why would you want to do this?
>
>Allows you to squeeze more LPG in the tank. Propane can be compressed much
>more efficiently than air
Propane is fed in to the tank as liquid. To make room for this liquid
251/250 of that volume of vapour in the tank will condense to liquid
and occupy 1/250th of the volume it did when vapour, which makes room
for the additional liquid with nearly no change in pressure. If the
incoming liquid is cooler than the tank the pressure will drop, if
hotter the pressure will rise and if the same there will be very small
rise in pressure as the condensing vapour gives up a tiny bit of heat.
Air won't condense, it acts as a spring. As the liquid level rises the
volume of air gets smaller but there is still the same amount of air
in the tank so tank pressure rises until the pump can't pump anymore
and it stalls with the tank part full.
Also air + propane = explosive mix so the tank shouldn't have air in
it.
.
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